Question
Give the electronic configuration of the transition elements. Write their four important characteristics.
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$\Delta_\text{f}\text{H}^\circ\text{CO}_2(\text{g})=-393\text{kJ mol}^{-1}$ and $\Delta_\text{f}\text{H}^\circ\text{H}_2\text{O(l})=-285.83\text{kJ mol}^{-1}.$

$\Delta\text{U}^\ominus$of combustion of methane is – X kJ mol–1. The value of $\Delta\text{H}^\ominus$ is:
$=\Delta\text{U}^\ominus$
$>\Delta\text{U}^\ominus$
$<\Delta\text{U}^\ominus$
$=0$